US5222605A - Automatic particle size analyzer using stacked sieves - Google Patents

Automatic particle size analyzer using stacked sieves Download PDF

Info

Publication number
US5222605A
US5222605A US07/818,048 US81804892A US5222605A US 5222605 A US5222605 A US 5222605A US 81804892 A US81804892 A US 81804892A US 5222605 A US5222605 A US 5222605A
Authority
US
United States
Prior art keywords
sieves
sieve
conveyor
particle size
size analyzer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/818,048
Other languages
English (en)
Inventor
Glenn J. Pogue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rotex Global LLC
Original Assignee
Rotex Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rotex Inc filed Critical Rotex Inc
Assigned to ROTEX, INC. reassignment ROTEX, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: POGUE, GLENN J.
Priority to US07/818,048 priority Critical patent/US5222605A/en
Priority to EP93902694A priority patent/EP0620765B1/en
Priority to AU34176/93A priority patent/AU3417693A/en
Priority to CA002126448A priority patent/CA2126448C/en
Priority to DE69230149T priority patent/DE69230149T2/de
Priority to PCT/US1992/011117 priority patent/WO1993013877A1/en
Priority to JP5512463A priority patent/JP2774873B2/ja
Priority to MX9300094A priority patent/MX9300094A/es
Publication of US5222605A publication Critical patent/US5222605A/en
Application granted granted Critical
Assigned to ROTEX GLOBAL, LLC reassignment ROTEX GLOBAL, LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ROTEX, INC.
Assigned to GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT reassignment GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT SECURITY AGREEMENT Assignors: ROTEX GLOBAL, LLC
Assigned to ROTEX GLOBAL, LLC reassignment ROTEX GLOBAL, LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: GENERAL ELECTRIC CAPITAL CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/38—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens oscillating in a circular arc in their own plane; Plansifters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements

Definitions

  • This invention relates to an apparatus and method for automatically measuring the weights and/or relative proportions of the size ranges of particles in particulate mixtures.
  • Particle size analyses that is, measurements of the relative proportions by weight of particles of a given sample in different size (diameter) ranges, are widely used in process control and optimization.
  • the size range of a given fraction may be characterized, for example, as being between 0.01 and 0.05 inch, which means that the particles in that range are retained on a screen having openings smaller than 0.01 inch but pass through a sieve having openings larger than 0.05 inch.
  • Such analyses are frequently performed with sieves (screens) of progressively finer mesh sizes, such as the well-known U.S. Standard testing sieves.
  • the sample to be analyzed is placed on the coarsest sieve at the top of a stack of sieves and the entire stack is shaken, particles of different size ranges being retained on different sieves.
  • the sieves are then removed one by one from the stack and the fractions on them are emptied onto a scale and weighed to determine the proportion of the fraction relative to the total sample weight. If the analysis is carried out manually, as is often done, the procedure is slow and labor intensive.
  • a mechanical shaking device such as the "Ro-tap" shaker made by W.S.
  • the entire drum is shaken, so that particles finer than the mesh of the sieve pass through and fall onto a weigh pan and are weighed automatically by an electronic scale.
  • the drum is then indexed rotationally so that the next finest sieve is at the bottom; the particles retained on the first sieve fall onto the second sieve.
  • the drum is again shaken and the particle fraction which can pass through the second sieve is thereby separated.
  • the process of drum indexing, shaking, and weighing is continued automatically until the sample has been screened on each sieve.
  • the fraction weights may be totaled by a computer and their relative percentages determined and displayed in a readout.
  • the Gradex machine is expensive and comparatively slow by reason of the polygonal drum which must be indexed to and shaken at each rotational position. Moreover the analyses it provides do not always correlate directly with analyses made with a more conventional stack of standard screens. It has therefore been desirable to provide a machine which is comparatively simpler and faster, and which will provide accurate analyses using a standard stack of sieves rather than a polygonal drum, and which can be operated entirely automatically with virtually no operator attention.
  • the apparatus and method of this invention utilize a stack of sieves for making particle size analyses.
  • the sample to be analyzed is introduced onto the topmost (coarsest) sieve of the stack and the entire stack is vibrated or shaken as a unit to separate the fractions retained on the respective sieves.
  • a pan which is referred to and treated herein as a "sieve" even though it is actually imperforate
  • the individual sieves are then automatically and sequentially removed from the stack and emptied onto a weighing apparatus which sequentially records the weight of each fraction, from which the weight percentage proportions of the respective fractions can be calculated.
  • each sieve of the stack is separately mounted or cantilevered from a conveyor having a vertically oriented section or run and is movable around a horizontal bottom roll below the vertical run.
  • the conveyor is advanced or indexed downwardly to move the sieves downwardly to swing the sieves sequentially around the bottom roll.
  • Each sieve is inverted by its movement around the bottom roll, and dumps the retained particles onto an electronic weigh scale.
  • the diameter of the bottom roll is such that a sieve moving around the bottom roll is tipped sufficiently to dump the particles retained on it before particles are dumped from the next sieve.
  • the sieves are thereby emptied individually, and the various fractions are weighed separately. After all the sieves have been emptied, the conveyor reverses to return the empty sieves back around the roll, where they are again aligned as a stack to receive and analyze a subsequent sample. The entire operation is automatic.
  • the apparatus optionally but preferably includes an automatic sieve cleaner.
  • the cleaner engages each sieve while it is inverted over the weighing pan, after most of the particles have fallen from it.
  • the cleaner operates a brush or other cleaning device whereby remaining adherent particles are dislodged and emptied from the sieve for weighing with the rest of the fraction separated on it.
  • the invention includes optional but preferred means for automatically temporarily clamping the sieves together, in alignment on a vertical axis, for shaking. The clamping means is released after shaking so that the sieves can be individually moved around the bottom roll.
  • FIG. 1 is a perspective view, partly diagrammatic, of an automatic particle size analyzer in accordance with a preferred embodiment of the invention, showing the bottommost sieve of the stack being separated from the others as it swings around the bottom roll, thereby to dump the retained particles onto the weighing means;
  • FIG. 2 is a diagrammatic perspective, partly broken away, of the conveyor operating mechanism of the analyzer, showing a sieve which has been inverted after passing around the bottom roll, preparatory to cleaning;
  • FIG. 3 is a perspective view generally similar to FIG. 2 but particularly showing the means by which the sieves are brought into alignment for shaking;
  • FIG. 4 is a vertical cross section of the apparatus, taken on line 4--4 of FIG. 1, and shows the stack of sieves in the starting position, ready to receive a sample to be analyzed;
  • FIG. 5 is a vertical section similar to FIG. 4 but shows the relative positions of the sieves after two sieves have been emptied and a third is being emptied;
  • FIG. 6 is view similar to FIG. 5 but shows the sieve cleaner moved into position to engage and clean a sieve
  • FIG. 7 is an enlarged partial vertical section taken on line 7--7 of FIG. 4;
  • FIG. 8 is an enlarged fragmentary cross section of a sieve engaged by the cleaner.
  • FIG. 9 is a perspective view, partly broken away, showing the means by which a sieve is secured to its holder.
  • the preferred embodiment of the automatic particle size analyzer 10 which is shown in the drawings is housed in a cabinet 12 having a hinged door 14.
  • the apparatus utilizes a series or set of graduated sieves, seven in the embodiment shown, comprising sieves designated as 16a, b, c, d, e, and f, and an imperforate bottom pan 18 (see FIG. 7).
  • Each sieve comprises a stackable cylindrical skirt 20 with axially spaced upper and lower peripheral flanges, and a screen or mesh 22 mounted inside skirt 20 (see FIGS. 2, 3 and 8).
  • the skirts are circular, about 8 inches in diameter and approximately 3 inches high, and may be conventional commercial screens.
  • the skirts are of uniform diameter and the sieves may differ only in the size of the screens 22 which they mount.
  • the respective sieves are progressively finer in the downward direction as viewed in FIG. 4, the topmost sieve 16a having the coarsest mesh.
  • An application might for example utilize U.S. Standard testing sieves Nos. 30, 35, 40, 50, 70, and 120 as the sieves 16a-16f.
  • the apparatus shown thus separates seven fractions (including the fines which are collected in bottom pan 18) which is sufficient for most analyses; if fewer fractions are needed, one or more sieves can be replaced with a dummy skirt having no sieve or a coarse sieve.
  • Each sieve 16a-f and 18 is seated on and secured to a modular sieve holder or bracket 24 (see FIGS. 8 and 9).
  • the bracket comprises a flat plate having a center opening which is sized to receive the lower portion of sieve skirt 22.
  • Each sieve is removably secured in its holder 24, by a pair of swingable, spring loaded retainers 26, only one of which is shown.
  • the holders 24 are cantilevered (mounted at one side only) to a conveyor 28 preferably in the form of a wide, endless belt as shown in FIG. 3 of the type ordinarily used for horizontal conveyors.
  • Each sieve holder 24 is secured by one or more bolts 34 through the conveyor (see FIG. 8).
  • Conveyor 28 passes around an upper roll 30 and a lower or bottom roll 32 (FIG. 3).
  • the region traversed between upper roll 30 and lower roll 32 is referred to herein as vertical run 33.
  • a back run 35 extends parallel to run 33 on the other side of the rolls.
  • the sieves and holders are nestable to form a vertically aligned stack 31 (see FIG.
  • each sieve 16b-f and 18 seats against the bottom of the holder of a sieve above it.
  • This stack can be shaken as a unit to make the separation; particles fall from one sieve directly into the next sieve below it and cannot escape laterally from the stack.
  • Lower roll 32 is mounted for rotation in journals secured to cabinet 12.
  • Upper roll 30 is journaled on an upper roll support arm 36 which is pivoted to the cabinet 12 by pivot 38.
  • Spring means 40 which may be a coil spring as shown or a selectively operable air spring, biases support arm 36 upwardly about pivot 36 to maintain tension on conveyor 28.
  • Conveyor drive means in the form of an electric motor 41 with a speed reducer and brake is mounted on support arm 36 and is connected to turn upper roll 30 by a timing belt 42. Tension on belt 42 is maintained by an adjusting screw 44 (see FIG. 2).
  • Cabinet 12 includes a top portion 52 which can be removed from a lower portion 53 for access to the top of the operating mechanism.
  • the sample to be analyzed is introduced through an opening 46 in top portion 52 and falls through a funnel 48 which in turn leads to a tubular chute 50 (FIG. 4).
  • Funnel 48 separates from chute 50 if the cabinet top portion is removed.
  • Chute 50 is mounted on a shaker top plate or mounting plate 54 which in turn is supported at one side by and on two parallel vertical leaf springs 56, 56 which project upwardly from bracket 58 in the cabinet.
  • Leaf springs 56, 56 which may be resiliently flexible fiberglass strips, support top plate 54 and the sieves and other structure supported from it for vibration (FIG. 2).
  • drive means 60 includes a motor 62 on an adjustable bracket which in turn is mounted to the cabinet wall.
  • a screw adjuster 69 bears between the bracket and the cabinet wall to tension the belt (FIG. 4).
  • Motor 62 is connected by a timing belt 64 to turn an eccentric pin 66, which is journaled in and supports top plate 54 at the side thereof opposite leaf springs 56. Operation of motor 62 turns eccentric pin 66 in a circular orbit and thereby imparts a screening motion to plate 54 and the sieves suspended from it.
  • the pin-engaging side of plate 54 (the right side as seen in FIG.
  • Eccentric pin 66 may, for example, move in an orbit of 1-3/16 inch diameter at a rate of 280 rpm, and thereby generate a lateral sieve acceleration of 1.3 g. Shaking cycle times in the range of 3 to 10 minutes are sufficient for many purposes.
  • a "tapper” or vertically reciprocating piston 67 may be mounted to top plate 54, to apply a repetitive "tapping" pulse or impact to the stack of sieves during shaking.
  • the tapper is an air cylinder which is rapidly reciprocated to strike the plate, for instance at 200 cycles per minute. This assists in separating the particles and further simulates the tapping movement that is applied in mechanical shakers.
  • sieves 16a-f and 18 are individually cantilevered from conveyor 28 and are supported by it only at one side, they tend to sag downward under gravity if not further supported (note the tilt of the sieves on the right side of the conveyor in FIG. 6). Such sagging would be disadvantageous during shaking, because the central vertical axes of the individual sieves would be disaligned from one another and gaps could open between adjacent sieves and holders through which particles being screened could escape over the rims of the skirts 20. It has been found highly effective to provide means which position the sieves horizontally when they are to be shaken, and additionally to clamp them together in vertical alignment for shaking so that there is minimal or essentially no relative motion between the sieves during shaking.
  • the sieves need not, however, be clamped together during the time that conveyor 28 is moving them, and they must of course be free to separate as they move about bottom roll 32.
  • a sieve holding back plate 68 shown in FIGS. 2, 3 and 4, which is mounted vertically from top plate 54 and which presents stop ledges that coact with a series of stop pins 70 on the respective sieve holders 24.
  • Pins 70 extend from the sieve holders, through conveyor 28 (see FIG. 4) toward plate 68. The pins are simultaneously engageable against a series of sequentially offset stop ledges 72 in holding plate 68 as the sieves approach their topmost positions on vertical run 33.
  • the stop ledges 72 are offset laterally like "stairs,” along a side edge of plate 68 and are spaced apart vertically according to the distance between the respective pins 70 (see FIG. 3) so that as the conveyor moves upwardly, the pins engage the respective ledges.
  • the pins essentially simultaneously engage the respective stop ledges, which arrests their further upward movement; short final upward travel of the conveyor thereby tilts the holders upwardly (counterclockwise in FIG. 5) from their sagged positions to the substantially horizontal positions shown in FIG. 4.
  • Conveyor drive motor control means 98 or a limit safety switch 73 (FIG. 4), stops operation of motor 41 at the conveyor position at which the sieves are substantially horizontal. It is important that the sieves be level for shaking (for the same reason, cabinet 12 may have leveling screws 71 at its base to level the cabinet itself).
  • the sieves are then aligned laterally with one another and are clamped axially (vertically) for shaking.
  • This alignment and clamping is preferably provided by double-functioning sieve aligning and clamping means, generally designated by 74, best shown in FIG. 7.
  • the means 74 operates to press opposed V-sectioned lateral clamps 76, 76 diametrically toward the sieves, into engagement with corresponding V-shaped notches 78, 78 on opposite sides of the sieve holders 24.
  • the clamps 76, 76 move toward one another in a vertical plane, generally parallel to the plane of vertical run 33, to cam the sieve holders laterally (horizontally) into alignment with one another.
  • the double-acting means 74 also clamps the sieves together vertically as well as aligning them horizontally.
  • the means 74 also operates diametrically opposed vertically swingable clamp arms 80, 80 to apply a lifting force to the bottom holder of the stack (see FIG. 7).
  • the vertical clamping arms 80 lift the entire stack of sieves upwardly until the top sieve 16a abuts and is clamped against the underside of top plate 54 which acts as a stop (see FIG. 7).
  • clamping means 74 constrains the stack of sieves both laterally and vertically.
  • each clamp cylinder 82 is pivotally connected to an upper clamp swing arm 84, which at an outer end is connected by a pivot 85 to a clamp means mounting bracket 86 carried from top plate 54 (see FIG. 2).
  • the other end of upper clamp swing arm 84 is pivotally secured to lateral clamping arm 76.
  • Cylinder 82 operates a piston rod 88, the lower end of which is connected to swing the vertical clamp arm 80 about its pivot 90 (see FIG. 7).
  • Clamp arm 80 is pivoted to a bracket on side plate 92. Side plate 92 is connected to top plate 54, as is bracket 86.
  • piston rod 88 is extended, which swings both the upper clamp swing arm 84 and the vertical clamp arm 80 about their respective pivots.
  • piston rod 88 swings in a clockwise direction about its pivot 85, as indicated by the arrow 87, thereby moving lateral clamp arm 76 to the left, into the notches 78 of the sieve holders 24.
  • extension of piston 88 swings vertical clamping arm 80 clockwise about its pivot 90, bringing the roller 94 thereof upwardly against the bottom of the stack.
  • a lower clamping arm link 96 is pivotally connected between the lower end of lateral clamping arm 76 and a mounting bracket on side plate 92.
  • the two arms 84, 96 establish a parallelogram-type movement which insures that clamp arm 76 remains vertical as it is moved laterally (FIG. 7).
  • the sieves remain clamped only during the shaking cycle. (Because the clamping means is suspended from top plate 54, it moves with the sieves during the shaking cycle.)
  • the clamping means on the opposite side of the stack may be a mirror image of that just described and operates in a similar manner.
  • control means 98 directs fluid pressure in the opposite direction to retract piston arms 88, and thereby essentially simultaneously disengages the lateral clamping arms and vertical clamping arms from the stack of sieves.
  • Drive motor 40 is then energized to move the stack of sieves slowly downwardly toward lower roll 32. Movement is gradual, at a rate that does not throw particles off the respective sieves, for example 6.5 feet per per minute.
  • bottom pan 18 is the first to move around roll 32. Because of the small diameter of roll 32 in relation to the larger size of the sieves, relatively short conveyor travel achieves a large angular swing of the respective sieve through an essentially vertical position, to an inverted or dump position such that the particles in that sieve fall out of it.
  • each sieve is inverted before the next sieve starts to empty (see FIG. 5). It is preferred that each sieve be stopped in a position in which it is angulated at about 120° to 140° with respect to its horizontal stacked position. Stopping is controlled by a switch 101 (FIG. 7), which de-energizes motor 40 when the sieve holder, at the dump position, engages the switch. The motor brake promptly stops and holds the belt with the sieve in the dump position. As it is inverted by movement around the bottom roll 32, each sieve dumps its contents into a weigh pan 100 (see FIG. 5). Weigh pan 100 rests on an electronic weigh scale 102 which provides a readout of the weight of particles discharged into it from each pan.
  • Scales suitable for this purpose are commercially available, for example Toledo Scale Corporation Model SM 6000.
  • the scale may reset or "zeroize” after recording the weight of the fraction; or preferably the computer 99 records the successively increasing weights in the pan and obtains the individual fraction weights by sequential subtraction, in known manner.
  • Pan 100 can be removed from scale 102 through door 14, for emptying. It is not necessary to empty the pan after each sieve has been dumped into it, or even after an entire sample analysis has been completed. An analysis usually requires samples of only a few hundred grams; pan 100 may be sized to hold many such samples.
  • sieve cleaning means to brush or knock particles from each sieve (preferably including bottom pan 18) while it is inverted over the weigh pan 100 so that such particles can be included in the weight of the respective fraction.
  • the sieve cleaning means designated generally by 104 basically comprises a rotary brush 106 which is automatically moved from an inactive position shown in FIG. 5, into a cleaning position shown in FIGS. 6 and 8 in which the brush brushes the bottom (lower) side of the mesh of a sieve in the dump position.
  • Brush 106 is dimensioned to engage substantially the entire area of mesh 22, to brush particles from the mesh so that they will fall into weigh pan 100 (see FIG. 8).
  • Brush 106 is rotated by a brush drive motor 108, which is automatically energized at the appropriate time by control 98.
  • the brush 106 is operated to brush the screen preferably by rotation in both directions; the cleaning means is removed to its inactive position before the conveyor is operated to move the just-cleaned sieve from the dump position and the next sieve into that position.
  • a cleaner swing arm 110 For movement of the brush and motor between the inactive position and the cleaning position, they are mounted on a cleaner swing arm 110 which is journaled to the cabinet base at pivot 112.
  • the swing arm 110 is turned about pivot 112 by dual pneumatic cleaner positioning cylinders 114, one of which is shown in FIG. 5.
  • the piston of cylinder 114 positions the cleaning means in the inactive position; when retracted (FIG. 6) the piston swings arm 110 to bring brush 106 into approximate planarity with the mesh 22 of the sieve in the dump position.
  • brush 106 is yieldably mounted on motor shaft 115 and is biased outward (toward the sieve) by springs 116.
  • Some movability of brush 106 on shaft 115 is provided by a pivot-in-slot connection 117. This provides a certain amount of yieldability and flexibility so that the brush will be brought more gently into contact and alignment with the screen 22.
  • cleaner clamping means 118 is provided to engage the respective sieve holder 24 in the dump position and pull the holder and sieve in a direction toward the brush, as indicated by arrow 119 in FIG. 8.
  • the cleaner clamping means has a clamp pad 122 which is operated by a pneumatic cylinder 120 mounted on and moved with arm 110. Clamp pad 122 is extended while the respective sieve is moving toward dump position so that holder 24 and its sieve will clear the extended clamp pad as the holder is swinging around roll 32. When retracted, pad 122 engages the edge of the holder (FIG.
  • cleaning means 104 is retracted and conveyor 28 is operated to move the emptied sieve past the dump position and to advance the next sieve to that position. Just as the sieves tend to tilt downwardly on run 33, they again tend to tilt when they are on back run 35 after they have been emptied. The lowermost tilted sieve could interfere with movement of cleaning means 104.
  • a back run sieve lifter 126 (FIGS. 2, 4, and 6). This comprises a pneumatic cylinder 128 which is swingably suspended in cabinet 12, and which operates a pivoted lifting arm 130 that is lifted to engage beneath the lowermost sieve on back run 35, to pull the sieves upward sufficiently for brush 106 to pass beneath them. The lifting movement is illustrated in FIGS. 2, 5 and 6.
  • a safety switch 124 (FIG. 4) is desirable as a failsafe, to limit conveyor movement up the back run after all the sieves have been cleaned.
  • Computer 99 (FIG. 1) is programmed to count the sieves as they are cleaned, and signals control 98 to reverse the motor after all have been cleaned, thereby to return the empty sieves to starting position. (The sieves need not be cleaned on the return.)
  • Control 98 acts as a power relay, to control the application and cut-off of operating power to the various motors and solenoid operated valves. It is responsive to low power signals from computer 99 and the limit switches.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Sorting Of Articles (AREA)
US07/818,048 1992-01-08 1992-01-08 Automatic particle size analyzer using stacked sieves Expired - Lifetime US5222605A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US07/818,048 US5222605A (en) 1992-01-08 1992-01-08 Automatic particle size analyzer using stacked sieves
JP5512463A JP2774873B2 (ja) 1992-01-08 1992-12-18 積み重ねたふるいを用いる自動粒子サイズ・アナライザ
AU34176/93A AU3417693A (en) 1992-01-08 1992-12-18 Automatic particle size analyzer using stacked sieves
CA002126448A CA2126448C (en) 1992-01-08 1992-12-18 Automatic particle size analyzer using stacked sieves
DE69230149T DE69230149T2 (de) 1992-01-08 1992-12-18 Automatischer analysator der teilchen grösse ausgerüstet mit gestapelten sieben
PCT/US1992/011117 WO1993013877A1 (en) 1992-01-08 1992-12-18 Automatic particle size analyzer using stacked sieves
EP93902694A EP0620765B1 (en) 1992-01-08 1992-12-18 Automatic particle size analyzer using stacked sieves
MX9300094A MX9300094A (es) 1992-01-08 1993-01-08 Analizador de tamaño de particula que utiliza tam ices apilados

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/818,048 US5222605A (en) 1992-01-08 1992-01-08 Automatic particle size analyzer using stacked sieves

Publications (1)

Publication Number Publication Date
US5222605A true US5222605A (en) 1993-06-29

Family

ID=25224519

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/818,048 Expired - Lifetime US5222605A (en) 1992-01-08 1992-01-08 Automatic particle size analyzer using stacked sieves

Country Status (8)

Country Link
US (1) US5222605A (ja)
EP (1) EP0620765B1 (ja)
JP (1) JP2774873B2 (ja)
AU (1) AU3417693A (ja)
CA (1) CA2126448C (ja)
DE (1) DE69230149T2 (ja)
MX (1) MX9300094A (ja)
WO (1) WO1993013877A1 (ja)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5588535A (en) * 1994-10-12 1996-12-31 Synectic Technology, Inc. Sample preparation system for separating wear particles by size and magnetic characteristics
GB2321528A (en) * 1996-12-31 1998-07-29 David George Anthony Apparatus for weighing sieves
WO2001038851A1 (en) * 1999-11-25 2001-05-31 Technometrics Ltd. Particle size distribution analyser
EP1170065A1 (de) * 2000-07-06 2002-01-09 ALLGAIER WERKE GmbH Taumelsiebmaschine
US6575303B1 (en) 1998-10-08 2003-06-10 Ai Enterprises, Inc. Processing a product including aggregate materials and a volatile component
US6581780B1 (en) 2001-01-16 2003-06-24 Ai Enterprises, Inc. Automatic gradation unit
US6698593B1 (en) * 2002-05-03 2004-03-02 M-I L.L.C. Vibratory screen separator
US20040206671A1 (en) * 2001-07-18 2004-10-21 Wolfram Stichert Sieve device for screening solid material
US20050005685A1 (en) * 2002-05-03 2005-01-13 Composite Products, Inc. Method of determining an average length of reinforcing fiber in a sample of reinforcing fibers
US20050072717A1 (en) * 2001-09-21 2005-04-07 Russell Finex Limited Sieving apparatus
US20080011110A1 (en) * 2006-07-12 2008-01-17 Costonis Joel F Improved aggregate mixture analysis device
GB2470075A (en) * 2009-05-08 2010-11-10 Endecotts Ltd Sieve shaker separator and weighing apparatus
CN103480579A (zh) * 2013-10-10 2014-01-01 鞍钢集团矿业公司 散体岩石粒度分布的筛分称量装置及筛分称量方法
US20140108182A1 (en) * 2012-10-16 2014-04-17 Okanagan Quality Control Ltd. Aggregate processing control system
US20140291214A1 (en) * 2011-11-02 2014-10-02 Dow Global Technologies Llc Vibratory screener cleaning system
US9623446B2 (en) * 2013-10-30 2017-04-18 Nara Machinery Co., Ltd. Sieving apparatus and sieving method
CN107014712A (zh) * 2017-05-24 2017-08-04 中国铁路总公司 一种碎石针片状颗粒含量检测方法及装置
WO2017192468A1 (en) * 2016-05-03 2017-11-09 M-I L.L.C. Rock box splitter
WO2018044411A1 (en) * 2016-09-04 2018-03-08 Michael Cecchi A device for separating plants and the plant byproduct
CN108254216A (zh) * 2018-03-15 2018-07-06 攀钢集团西昌钢钒有限公司 一种高炉槽的矿料取样方法、装置及可读存储介质
CN110553945A (zh) * 2018-05-31 2019-12-10 中国农业科学院北京畜牧兽医研究所 一种全株玉米青贮籽粒筛分装置及使用该装置的评测方法
US10758940B1 (en) 2018-03-01 2020-09-01 Christopher J. Young Mobile sieving apparatus and method for harvesting cannabis pollen and trichomes
US10900877B1 (en) * 2017-03-08 2021-01-26 Iowa State University Research Foundation, Inc. Methods, apparatus, and systems to extract and quantify minute objects from soil or feces, including plant-parasitic nematode pests and their eggs in soil
CN112858075A (zh) * 2021-02-08 2021-05-28 中冶长天国际工程有限责任公司 一种多组分原料捏合效果的检测方法
US20230234099A1 (en) * 2021-02-25 2023-07-27 Jay Hirshberg Automated object-sorting apparatus
CN117399262A (zh) * 2023-12-13 2024-01-16 山东江拓机械设备有限公司 一种石英制品生产加工用石英石筛选设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773599A (en) * 1953-10-19 1956-12-11 Fmc Corp Screen cleaning device
US3098037A (en) * 1960-03-14 1963-07-16 Gilson Screen Company Portable tiltable separator
US3439800A (en) * 1967-01-09 1969-04-22 Gilson Screen Co Aggregate size testing apparatus and process
US4487323A (en) * 1983-05-09 1984-12-11 Weyerhaeuser Company Automatic particle-size analyzer
US5059310A (en) * 1989-08-31 1991-10-22 Rhewum Gmbh Analytical sieve apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773599A (en) * 1953-10-19 1956-12-11 Fmc Corp Screen cleaning device
US3098037A (en) * 1960-03-14 1963-07-16 Gilson Screen Company Portable tiltable separator
US3439800A (en) * 1967-01-09 1969-04-22 Gilson Screen Co Aggregate size testing apparatus and process
US4487323A (en) * 1983-05-09 1984-12-11 Weyerhaeuser Company Automatic particle-size analyzer
US5059310A (en) * 1989-08-31 1991-10-22 Rhewum Gmbh Analytical sieve apparatus

Non-Patent Citations (8)

* Cited by examiner, † Cited by third party
Title
Seishin I Robot Sifter RPS 85 Seishin Enterprise Co., Ltd. *
Seishin II Robot Sifter RPS 85EX Seishin Enterprise Co., Ltd. *
Seishin II-Robot Sifter RPS-85EX-Seishin Enterprise Co., Ltd.
Seishin I-Robot Sifter RPS-85-Seishin Enterprise Co., Ltd.
Tyler I Operation, Maintenance and Parts Manual Ro Tap Testing Sieve Shaker W. S. Tyler, Inc. *
Tyler II Specification Tables For Industrial Wire Cloth and Woven Wire Screens Cat. No. 74, 1981 Ed., W. S. Tyler, Inc. *
Tyler II-Specification Tables For Industrial Wire Cloth and Woven Wire Screens-Cat. No. 74, 1981 Ed., W. S. Tyler, Inc.
Tyler I-Operation, Maintenance and Parts Manual-Ro-Tap Testing Sieve Shaker-W. S. Tyler, Inc.

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5588535A (en) * 1994-10-12 1996-12-31 Synectic Technology, Inc. Sample preparation system for separating wear particles by size and magnetic characteristics
GB2321528A (en) * 1996-12-31 1998-07-29 David George Anthony Apparatus for weighing sieves
US6929393B1 (en) * 1998-10-08 2005-08-16 Astec, Inc. Asphalt production plant
US6575303B1 (en) 1998-10-08 2003-06-10 Ai Enterprises, Inc. Processing a product including aggregate materials and a volatile component
US6829955B1 (en) 1999-11-25 2004-12-14 Technometrics Ltd. Particle size distribution analyser
WO2001038851A1 (en) * 1999-11-25 2001-05-31 Technometrics Ltd. Particle size distribution analyser
EP1170065A1 (de) * 2000-07-06 2002-01-09 ALLGAIER WERKE GmbH Taumelsiebmaschine
US6581780B1 (en) 2001-01-16 2003-06-24 Ai Enterprises, Inc. Automatic gradation unit
US7147109B2 (en) * 2001-07-18 2006-12-12 Hte Aktiengesellschaft The High Throughput Experimentation Company Sieve device for screening solid material
US20040206671A1 (en) * 2001-07-18 2004-10-21 Wolfram Stichert Sieve device for screening solid material
US20050072717A1 (en) * 2001-09-21 2005-04-07 Russell Finex Limited Sieving apparatus
US6925857B2 (en) * 2002-05-03 2005-08-09 Composite Products, Inc. Method of determining an average length of reinforcing fiber in a sample of reinforcing fibers
US20050005685A1 (en) * 2002-05-03 2005-01-13 Composite Products, Inc. Method of determining an average length of reinforcing fiber in a sample of reinforcing fibers
US6698593B1 (en) * 2002-05-03 2004-03-02 M-I L.L.C. Vibratory screen separator
US20080011110A1 (en) * 2006-07-12 2008-01-17 Costonis Joel F Improved aggregate mixture analysis device
US9714894B2 (en) * 2006-07-12 2017-07-25 Joel F. Costonis Aggregate mixture analysis device
GB2470075A (en) * 2009-05-08 2010-11-10 Endecotts Ltd Sieve shaker separator and weighing apparatus
US9156062B2 (en) * 2011-11-02 2015-10-13 Dow Global Technologies Llc Vibratory screener cleaning system
US20140291214A1 (en) * 2011-11-02 2014-10-02 Dow Global Technologies Llc Vibratory screener cleaning system
US9146554B2 (en) * 2012-10-16 2015-09-29 Adam Hoban Aggregate processing control system
US20140108182A1 (en) * 2012-10-16 2014-04-17 Okanagan Quality Control Ltd. Aggregate processing control system
CN103480579B (zh) * 2013-10-10 2015-07-01 鞍钢集团矿业公司 散体岩石粒度分布的筛分称量装置及筛分称量方法
CN103480579A (zh) * 2013-10-10 2014-01-01 鞍钢集团矿业公司 散体岩石粒度分布的筛分称量装置及筛分称量方法
US9623446B2 (en) * 2013-10-30 2017-04-18 Nara Machinery Co., Ltd. Sieving apparatus and sieving method
GB2565717B (en) * 2016-05-03 2022-03-23 Mi Llc Rock box splitter
WO2017192468A1 (en) * 2016-05-03 2017-11-09 M-I L.L.C. Rock box splitter
GB2565717A (en) * 2016-05-03 2019-02-20 Mi Llc Rock box splitter
US10888900B2 (en) 2016-05-03 2021-01-12 M-L L.L.C. Rock box splitter
US10786816B2 (en) 2016-09-04 2020-09-29 Michael Cecchi Device for separating plants and the plant byproduct
WO2018044411A1 (en) * 2016-09-04 2018-03-08 Michael Cecchi A device for separating plants and the plant byproduct
US10900877B1 (en) * 2017-03-08 2021-01-26 Iowa State University Research Foundation, Inc. Methods, apparatus, and systems to extract and quantify minute objects from soil or feces, including plant-parasitic nematode pests and their eggs in soil
CN107014712B (zh) * 2017-05-24 2023-12-26 中国铁路总公司 一种碎石针片状颗粒含量检测方法及装置
CN107014712A (zh) * 2017-05-24 2017-08-04 中国铁路总公司 一种碎石针片状颗粒含量检测方法及装置
US10758940B1 (en) 2018-03-01 2020-09-01 Christopher J. Young Mobile sieving apparatus and method for harvesting cannabis pollen and trichomes
CN108254216A (zh) * 2018-03-15 2018-07-06 攀钢集团西昌钢钒有限公司 一种高炉槽的矿料取样方法、装置及可读存储介质
CN110553945A (zh) * 2018-05-31 2019-12-10 中国农业科学院北京畜牧兽医研究所 一种全株玉米青贮籽粒筛分装置及使用该装置的评测方法
CN112858075A (zh) * 2021-02-08 2021-05-28 中冶长天国际工程有限责任公司 一种多组分原料捏合效果的检测方法
US20230234099A1 (en) * 2021-02-25 2023-07-27 Jay Hirshberg Automated object-sorting apparatus
US11969758B2 (en) * 2021-02-25 2024-04-30 Jay Hirshberg Automated object-sorting apparatus
CN117399262A (zh) * 2023-12-13 2024-01-16 山东江拓机械设备有限公司 一种石英制品生产加工用石英石筛选设备
CN117399262B (zh) * 2023-12-13 2024-03-22 禄晨新材料技术研发(山东)有限公司 一种石英制品生产加工用石英石筛选设备

Also Published As

Publication number Publication date
CA2126448C (en) 2001-01-09
EP0620765A1 (en) 1994-10-26
DE69230149D1 (de) 1999-11-18
EP0620765B1 (en) 1999-10-13
AU3417693A (en) 1993-08-03
WO1993013877A1 (en) 1993-07-22
JP2774873B2 (ja) 1998-07-09
CA2126448A1 (en) 1993-07-22
MX9300094A (es) 1993-07-01
EP0620765A4 (en) 1995-12-20
DE69230149T2 (de) 2000-04-27
JPH07503067A (ja) 1995-03-30

Similar Documents

Publication Publication Date Title
US5222605A (en) Automatic particle size analyzer using stacked sieves
US4487323A (en) Automatic particle-size analyzer
US5059310A (en) Analytical sieve apparatus
US3439800A (en) Aggregate size testing apparatus and process
US3545281A (en) Method and apparatus for analyzing a particulate material
US4702826A (en) Screen cleaner for particle size analyzer
US4991598A (en) Method of and apparatus for automatically analyzing the degradation of processed leaf tobacco
JPS6297683A (ja) 木材チツプ分級装置
US3425553A (en) Grading apparatus
JP2571040Y2 (ja) 固体試料の粒度測定装置
JPH0380550B2 (ja)
US3521750A (en) Laboratory sifter
JPH091076A (ja) ふるい網破れ検知方法およびその装置
CN218483758U (zh) 烟梗筛分装置
CN117169064B (zh) 一种自动采样分析的饲料组分筛分定级设备
CN220004951U (zh) 一种色选机的出料装置
JP2673060B2 (ja) 組合せ計量機
JPS5870869A (ja) 粉粒体の粒度測定装置
JPH07256213A (ja) 粒状物の精選機
JPH0659462B2 (ja) 粉粒体の粒度測定方法
JPH05107104A (ja) 柔軟固形物計量装置
JPH0328377Y2 (ja)
JPH02157072A (ja) 粉粒体の多段式篩分け装置
JPH0514853U (ja) ワーク排出機構
JPH0440066B2 (ja)

Legal Events

Date Code Title Description
AS Assignment

Owner name: ROTEX, INC., OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:POGUE, GLENN J.;REEL/FRAME:005981/0748

Effective date: 19920102

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12

AS Assignment

Owner name: ROTEX GLOBAL, LLC, OHIO

Free format text: CHANGE OF NAME;ASSIGNOR:ROTEX, INC.;REEL/FRAME:019077/0545

Effective date: 20070315

AS Assignment

Owner name: GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT, IL

Free format text: SECURITY AGREEMENT;ASSIGNOR:ROTEX GLOBAL, LLC;REEL/FRAME:019084/0050

Effective date: 20070315

AS Assignment

Owner name: ROTEX GLOBAL, LLC, OHIO

Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:GENERAL ELECTRIC CAPITAL CORPORATION;REEL/FRAME:026852/0298

Effective date: 20110831